题目

①丙三醇；②甲烷；③乙醇；④甲醇，它们的沸点由高到低排列顺序正确的是（    ） A.①②③④          B.④③②①           C.①③④②         D.①③②④ 答案：C 解析:醇的沸点大于相应烷烃的沸点，不同醇的沸点随分子中碳原子数的递增而逐渐升高，所以有丙三醇＞乙醇＞甲醇＞甲烷。单词拼写（共10小题；每小题1分，满分10分）根据下列各句句意和空白之后的汉语提示词，在答题卡指定区域的横线上写出对应单词的正确、完整形式，每空只写一词。【小题1】 ______________(明显地) this key is the wrong one. It didn’t work.【小题2】It is ____________ (不礼貌) to keep silent when asked.【小题3】He did all he could to rescue the ______（溺水的） boy, and his effort was not in vain.【小题4】It is a long ________ （距离）from New York to Hongkong.【小题5】 What a surprise! It is his ________(九十) birthday.【小题6】I have kept the photos where I can see it every day as they always __________（使……想起）me of my university days in London.【小题7】We should know our own strengths and________（弱点） and think what could be done about them.【小题8】 The school was   ____   （包围）   by green trees【小题9】Her parents don’t   ____  （允许）her to go out alone at night.【小题10】 We have established socialist  ____  (制度)